To achieve the study goal, we have selected a 3-group randomized clinical trial (RCT) design that includes 1) Usual Care, 2) Intensive smoking cessation, and 3) Integrated Intensive Smoking and Alcohol Intervention. Having both a usual care and intensive smoking cessation conditions will enable us assess the added benefits of intensive smoking intervention which has been shown in the general population but has never been studied in homeless populations. Adding alcohol treatment to smoking intervention will enable us assess whether addressing alcohol abuse will result in improved smoking abstinence, an important scientific question that has never been studied in homeless populations.